docs: refresh harness contributor commands

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

README.md

@@ -180,6 +180,7 @@ uses:
 - Storybook interaction coverage for representative examples
 - Playwright smoke coverage for core Storybook flows
 - Storybook a11y checks as part of the docs review surface
+- a shared `tests/e2e/support/story-harness-contract.json` manifest for curated browser coverage
 
 ## Harness engineering
 
@@ -200,12 +201,14 @@ pnpm harness:select
 pnpm harness:suites
 pnpm harness:validate:static
 pnpm harness:validate:changed
+pnpm harness:validate:a11y
 pnpm harness:validate:component
 pnpm harness:validate:docs
 pnpm harness:validate:docs-smoke
 pnpm harness:validate:consumers
 pnpm harness:validate:pr
 pnpm harness:validate:release
+pnpm harness:orch -- doctor
 pnpm harness:orch -- status --run <run-id>
 ```